FloodRadar
Log inCreate free account

Explore FloodRadar

Map

The live map

By place

Where it flooded

Rivers

Right now

Community

Explore a river

Other water

River history

Weather

What’s coming

What fell

The bigger picture

Sewage

Sewage & storm overflows

My Gauges

Yours

Why?

About FloodRadar

Flood help

Buying or moving
Home › Rivers › Afon Tywi

Afon Tywi water levels

1 gauge, at Pothouse Wharf River Station. 10 storm overflows upstream are discharging now. Gauges in Carmarthenshire; levels are checked every 15 minutes.

1gauge
10overflows upstream discharging

Loading the map…

Gauges

Monitoring stations, source to mouth

StationTownLevel nowStatusTrend
Pothouse Wharf River Stationtidal—4.81 m 14m agoWithin its typical range▲

Also on the Tywi by the river map, but filed under another river name: Ystradffin No2 River Station, Dolau Hirion River Station, Manorafon River Station, Ty Castell River Station and Capel Dewi River Station.

Stations are listed from source to mouth as the water flows, traced on the river map (OS Open Rivers) and the Environment Agency’s own links between its gauges. A distance “by river” is along the river, and is shown only where the map traces the path.

Contains OS data © Crown copyright and database rights 2026.

Gauged tributaries

Streams and rivers with a gauge whose water joins the Tywi above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.

8 gauged tributaries, 8 gauges

Where the Tywi goes

No gauge below Pothouse Wharf River Station is known on the river map.

Tributaries and where they join are traced on the river map (OS Open Rivers, edition 2026-04) and the Environment Agency’s links between its gauges. The map holds distances between gauges, not the junctions themselves, so a junction is placed between two gauges, and no further up than the tributary’s own lowest gauge. Contains OS data © Crown copyright and database rights 2026.

Streams without a gauge

Named streams on the river map that flow into the Tywi and have no gauge of their own. Each has a page with what is known about it: the next gauge downstream, and any storm overflows or water-sampling points placed on it.

  • Afon Cennen (joins about 26 km above Ty Castell River Station)
  • Afon Cothi (joins about 810 m above Ty Castell River Station)
  • Afon Dulas (joins about 9.2 km above Ty Castell River Station)
  • Afon Gwenlais (joins about 3.2 km above Dolau Hirion River Station)
  • Afon Myddyfi (joins about 20 km above Ty Castell River Station)
  • Nant Clawdd-mawr (joins about 4.5 km above Manorafon River Station)
  • Nant Gurrey-fach (joins about 27 km above Ty Castell River Station)
  • Nant Harri (joins about 30 km above Ty Castell River Station)

Storm overflows upstream

35 storm overflows are traced upstream of Pothouse Wharf River Station, the Tywi’s lowest gauge on the river map: on the Tywi itself, on its gauged tributaries, and on smaller streams that join above there.

  • 10 report discharging now
  • 24 not discharging
  • 1 offline or silent: 1 monitor offline, 0 status unknown, 0 no live feed

Official figures for 2025, for the overflows traced upstream of Pothouse Wharf River Station: 2,348 spills over 25,707 hours in total, across the 27 that have a figure. 8 have no 2025 figure.

Each overflow is listed in the stretch above the first gauge its water reaches, from the source down, as on the Gauges tab. A stretch of the Tywi includes the smaller streams that join it there. Every overflow traced is listed here, each stretch in full. Back to the short lists →

Above Pothouse Wharf River Station, the Tywi’s highest gauge2 overflows · 1 discharging now
  • Peniel Overflow Discharging now since
    Dwr Cymru Welsh Water · into Nant Crychiau · 8.4 km by river above Pothouse Wharf River Station · 2024: 0 spills, 0 h
  • South Of Roundabout A40 A485 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Gwili · 4.7 km by river above Pothouse Wharf River Station · 2025: 111 spills, 842 h
Gwili, above Glan Gwili River Stationjoins the Tywi above Pothouse Wharf River Station8 overflows · 1 discharging now
  • Alltwallis Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Alltwalis · 18.6 km by river above Glan Gwili River Station · 2024: 89 spills, 997 h
  • Brynmeillion Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of The Nant Corrwg · 18.4 km by river above Glan Gwili River Station · 2025: 65 spills, 201 h
  • Cwmduad WwTW Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into Afon Duad · 14.2 km by river above Glan Gwili River Station · 2025: 109 spills, 1,948 h
  • Llanpumpsaint WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Gwili · 14.2 km by river above Glan Gwili River Station · 2025: 87 spills, 1,167 h
  • Pont Cynwyl Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Gochen · 10.7 km by river above Glan Gwili River Station · 2025: 14 spills, 102 h
  • Cynwyl Elfed WwTW Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into Afon Duad · 9.9 km by river above Glan Gwili River Station · 2025: 97 spills, 2,035 h
  • Cwmdwyfran Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Gwili · 4.4 km by river above Glan Gwili River Station · 2025: 29 spills, 296 h
  • Bronwydd WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Gwili · 2.5 km by river above Glan Gwili River Station · 2025: 197 spills, 2,495 h
Bran, above Llandovery River Stationjoins the Tywi above Manorafon River Station1 overflow
  • Cynghordy Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Bran · 8.6 km by river above Llandovery River Station · 2025: 48 spills, 182 h
Cloidach, above Felin Mynachdy River Stationjoins the Tywi above Ty Castell River Station1 overflow
Twrch, above Ddol Las River Stationjoins the Tywi above Ty Castell River Station1 overflow
  • Ffarmers WwTW Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Twrch · 950 m by river above Ddol Las River Station · 2024: 80 spills, 989 h
Above Ty Castell River Station16 overflows · 6 discharging now
  • Talley WwTW Overflow Discharging now since
    Dwr Cymru Welsh Water · into Afon Ddu · 42.0 km by river above Ty Castell River Station · no official annual figure
  • Caio WwTW Overflow Not discharging
    Dwr Cymru Welsh Water · into Annell · 35.9 km by river above Ty Castell River Station · 2025: 46 spills, 492 h
  • Llansawel WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Marlais · 32.7 km by river above Ty Castell River Station · 2025: 0 spills, 0 h
  • Rhosmaen Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into Nant Harri · 30.1 km by river above Ty Castell River Station · 2025: 37 spills, 50 h
  • Salem WwTW Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into Afon Myddyfi · 27.8 km by river above Ty Castell River Station · 2025: 97 spills, 1,029 h
  • Llandeilo Of Station Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Gurrey Fach · 27.3 km by river above Ty Castell River Station · 2025: 44 spills, 550 h
  • Llandeilo Yscubor Abad North Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Towy · 26.7 km by river above Ty Castell River Station · 2025: 82 spills, 146 h
  • Heol Bethlehem Llandeilo Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cennen · 26.2 km by river above Ty Castell River Station · 2025: 84 spills, 530 h
  • Llandeilo Near A483 Road Bridge Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tywi · 25.3 km by river above Ty Castell River Station · 2025: 105 spills, 301 h
  • Ffairfach WwTW Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Towy · 23.7 km by river above Ty Castell River Station · 2025: 158 spills, 2,161 h
  • Abergorlech Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Gorlech · 21.6 km by river above Ty Castell River Station · 2022: 1 spill, 0.5 h
  • Golden Grove WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Tywi · 19.2 km by river above Ty Castell River Station · 2025: 79 spills, 164 h
  • Brechfa Overflow Discharging now since
    Dwr Cymru Welsh Water · into Afon Marlais · 15.5 km by river above Ty Castell River Station · 2024: 140 spills, 2,169 h
  • Cwrt Henri WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Dulas · 12.3 km by river above Ty Castell River Station · 2025: 60 spills, 200 h
  • Pontargothi Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cothi · 3.3 km by river above Ty Castell River Station · 2024: 27 spills, 245 h
  • Pont-Ar-Gothi & Nantgaredig WwTW Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into Afon Cothi · 2.7 km by river above Ty Castell River Station · 2025: 136 spills, 2,730 h
Above Dolau Hirion River Station1 overflow · 1 discharging now
  • Cilycwm WwTW Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Gwenlais · 4.5 km by river above Dolau Hirion River Station · 2025: 162 spills, 1,321 h
Above Manorafon River Station5 overflows · 1 discharging now
  • Llandovery WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Bran · 19.0 km by river above Manorafon River Station · 2025: 134 spills, 2,208 h
  • Llangadog WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Sawdde · 8.6 km by river above Manorafon River Station · 2025: 95 spills, 942 h
  • Ashfield Llangadog Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Towy · 8.1 km by river above Manorafon River Station · 2025: 51 spills, 874 h
  • Manordeilo Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Towy · 5.3 km by river above Manorafon River Station · 2024: 186 spills, 3,937 h
  • Cwm Ifor WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Towy · 1.9 km by river above Manorafon River Station · 2025: 142 spills, 2,350 h

Near these gauges, connection not known

Within 3 km of one of the Tywi’s gauges in a straight line, but the river map cannot say whether their water reaches it.

  • Pothouse Wharf Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Towy · 120 m from Pothouse Wharf River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 102 spills, 609 h
  • Carmarthen Bridge Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Towy · 250 m from Pothouse Wharf River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 86 spills, 116 h
  • Morfa Lane Carmarthen Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Towy · 360 m from Pothouse Wharf River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 120 spills, 264 h
  • Old Station Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Towy · 390 m from Pothouse Wharf River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 125 spills, 345 h
  • Pensarn Overflow Not discharging
    Dwr Cymru Welsh Water · into Unnamed Watercourse · 400 m from Pothouse Wharf River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 8 spills, 39 h
  • Carmarthen Sticle Footpath Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Tawe · 470 m from Pothouse Wharf River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 61 spills, 192 h
  • Brickyard Lane Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Towy · 760 m from Pothouse Wharf River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 22 spills, 112 h
  • Heol Llangynnwr Carmarthen Overflow Not discharging
    Dwr Cymru Welsh Water · into River Towy · 800 m from Pothouse Wharf River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 105 spills, 716 h
  • Parc Hinds Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tywi · 1.1 km from Pothouse Wharf River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 2 spills, 30 h
  • Old Priory Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Towy · 1.1 km from Pothouse Wharf River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 93 spills, 220 h
  • Tanerdy Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Towy · 1.6 km from Pothouse Wharf River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 97 spills, 642 h

7 other overflows within 3 km of these gauges are placed below the Tywi’s lowest gauge or on another river, so not listed.

A status is the water company’s own monitor: it says whether an overflow is discharging, never how much or why, and a spill does not by itself explain a change in a river level. A status older than two hours is shown as unknown. Annual figures are the official returns: 12/24-hour spills for England and Wales, overflow events for Scotland (Scottish Water counts differently, so the two cannot be compared). “No data” means the monitor produced no usable data that year, not zero. Overflows are placed on OS Open Rivers (edition 2026-04), which leaves out many small channels: an overflow the map cannot place may still drain here. Contains OS data © Crown copyright and database rights 2026. Sewage in Britain’s rivers →

Live status: © Dŵr Cymru Welsh Water, from its Storm Overflow Map. Annual figures for Wales: Dŵr Cymru Welsh Water’s return to Natural Resources Wales, as compiled by The Rivers Trust, Open Government Licence.

Wave tracker for this river → Carmarthenshire rivers → All UK rivers